Construction Vehicle Tire Compound for Low Hysteresis and Charge Dissipation
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Solution Overview
Problem
Radial tyres for heavy-duty construction plant vehicles face challenges in reducing environmental impact while maintaining endurance and electrical conductivity, as they are primarily made from fossil-derived materials that contribute to ecological damage and have high hysteresis, leading to heat dissipation issues and potential electrostatic problems.
Innovation Solution
The tyres use elastomer compounds derived from non-fossil resources, with a high percentage of natural rubber and silica fillers, optimized to reduce hysteresis and enhance electrical conductivity, featuring a conductive pathway for electrostatic charge removal and a composition that prioritizes low hysteresis and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If tyres are made from fossil-derived materials, then electrical conductivity is maintained, but environmental impact increases and hysteresis is high
Solution Approach 1:
The patent changes the chemical composition parameters of the elastomer compounds by incorporating non-fossil derived materials (such as bio-based polymers or recycled rubber) while adjusting filler content and compound formulation to maintain electrical conductivity. This parameter change allows reduction of environmental impact without proportionally increasing hysteresis, as the new material composition can be optimized for lower energy loss characteristics.
Solution Approach 2:
The patent employs composite elastomer compounds that combine multiple materials including non-fossil derived elastomers, carbon black or other conductive fillers, and reinforcing agents. This composite approach enables simultaneous achievement of reduced environmental footprint, maintained electrical conductivity through conductive fillers, and controlled hysteresis through optimized material combinations and interfaces.
2Duration of action of stationary object
If hysteresis is reduced to lower operating temperatures, then endurance is improved, but electrical conductivity may be compromised
Solution Approach 1:
The patent applies local quality by creating distinct regions within the tyre structure with different material properties. Specifically, certain layers or zones are formulated with compounds optimized for low hysteresis to reduce heat generation and improve endurance, while other zones incorporate enhanced conductive fillers or materials to ensure electrical conductivity. This spatial differentiation allows each region to fulfill its specific function without compromising the other.
Solution Approach 2:
The patent uses composite materials with carefully balanced formulations that simultaneously provide low hysteresis and adequate electrical conductivity. By selecting specific combinations of elastomers, fillers, and additives, the composite compounds achieve optimized energy dissipation characteristics while maintaining sufficient conductive pathways through distributed conductive phases, thus satisfying both endurance and conductivity requirements.
3Object-affected harmful factors
If non-fossil elastomer compounds are used, then environmental footprint is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent achieves universality by developing non-fossil derived elastomer compounds that fulfill multiple functions simultaneously: they provide the basic elastomeric properties for tyre structure, incorporate conductive fillers for electrical conductivity, and include reinforcing agents for mechanical strength. This multi-functional formulation reduces the need for separate material layers or components, thereby simplifying the manufacturing process despite using advanced non-fossil materials.
Solution Approach 2:
The patent modifies formulation parameters of non-fossil elastomer compounds to optimize processing characteristics such as viscosity, cure rate, and moldability. By adjusting compound parameters like crosslink density, filler distribution, and plasticizer content, the materials become more amenable to conventional tyre manufacturing processes, reducing the complexity increment associated with using non-fossil derived materials.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution results in a tyre with reduced environmental impact, improved endurance due to lower operating temperatures, and effective electrostatic charge management, while maintaining performance and longevity, with a significant reduction in fossil material usage and improved rolling resistance.
Implementation Method 1
any elastomer compound having a viscoelastic loss tan(δ) defined as being the ratio of the viscous shear modulus G'' to the elastic shear modulus G'... at least 75% of the total mass of the elastomer compounds contained in the tyre is made up of elastomer compounds each of which has a viscoelastic loss tan(δ) less than or equal to 0.065
Implementation Method 2
an electrical resistivity less than or equal to 1E+06 ohm-centimetre (Ω·cm)... the tread wing, the linking layer, the carcass layer coating compound and the bead chafer layer constitute a preferred conductive pathway for conducting electrical charge between the ground and the rim
Data Source
AI summary
The environmental footprint of a tire for a construction plant vehicle is improved. To do so, the elastomer compounds derived from non-fossil resources represent a mass content greater than or equal to 65% of the total mass of the compounds of the tire, at least 75% of the total mass of the compounds of the tire is made up of elastomer compounds each of which has a viscoelastic loss, measured in terms of tan(δ), less than or equal to 0.065, and an electrical resistivity greater than or equal to 1E+10 ‘Ω·cm.